Six component 100x microscope objective

ABSTRACT

A six component achromatic oil immersion microscope objective having a magnification of 100X and a numerical aperture of 1.25.

OR 31659 ?23 r unm 1151 3,659,923 Shoema 1 1 May 2, 1972 7 TE FOR 1/11SS.'1\1G O1? 54] SIX COMPONENT 100:: Ml 8%130111 [56] mm cm OBJEC H i E UNITED STATES PATENTS [72] 3,524,694 8/1970 Klein ..3so/21s x [73] Assignee: American Optical Corporation, 3,537,772 11/1970 Shoemaker ..350/176 Southbridge, Mass. Primary Examiner-John K. Corbin [221 PM: AnomeyWilliam c. Neaion, Noble 5. Williams, Robert 1. [2 H App! No: 125,080 Bird and Bernard L. Sweeney ABSTRACT 52 us. c1. .350/215, 350/175 ML, 3355000111767, 4 six comment asthmatic on immersion microscope objw 51 1 1m. (:1. ..G02b 21/02 f gy a magmficam 100x and 3 apmu" 58 Field oISelrch ..350 21s,175 ML, 176,177

2 Claims, 1 Drawing Figure PARALLEL LIGHT Patented May 2, 1972 3,659,923

PARALLEL LIGHT /N VE N TOR Arthur H. Shoemaker By I Afforney optically aligned. Objective 2 is shown disposed relative to 1 SIX COMPONENT lOOX MICROSCOPE OBJECTIVE BACKGROUND OF THE INVENTION This invention relates to improvements in a microscope-objective, and in particular to an achromatic oil immersion microscope objective with a numerical aperture of substantially 1.25 and a magnification of substantially lOOX. it is the object of the present invention to provide such a microscope objective which is well corrected for the usual chromatic image aberrations as well as spherical aberration, coma, and lo astigmatism, while having a substantially flat image field when used with a telescope objective as described for example in U. S. Pat. No. 3,355,234 issued to Robert Muller.

DRAWING The drawing is an optical diagram of a microscope objective of the present invention.

DESCRIPTION Referring now to the drawing, a microscope objective is 2 object plane 16 supporting a specimen "with immersion oil in the space between the specimen 18 and the front lens element.

Lens 4 is a piano-convex lens, also designated 1. Lens isa concavo-convex positive meniscus shaped lens, also designated ll. Lens 8 is a concavoconvex positive meniscus shaped lens, also designated lll. Doublet 10 includes a convexconcave lens element IV and a double convex lens element V.

pressed in millimeters and a negative sign indicates radii on centers of curvature lying on the object side of their vertices.

Magnification-100x Nut-1.25

; Refractive I Abbe Lens Radius R Thickness T Space S index ND number v Sl=.l703F R llano I I Tl=1.sno1-" NDi-L5l700 1=s4.sn

Ft -1.18413 s2-.onor I rap-2.3mm l Ii 'm-mieas xm-Leosso 0-43.93

Hs -ZOZOQF ss-nnor 1 IMF-7.21981? n1 T;-i.0879F ND3-L60550 3-43.ss

Ra -4.48681 i l si-.ie4sF i tsp-7.210s! I l IV... 'rl-sssar xmnsom 14-2543 Ila-4.3862]? v 'rt-assier NDti-L-i8661 vii-84.47

ftp-5.41m

sis-om! R o-7.7012F l v1... 'n-ssoar NDb-L80i9l its-2.5.43

nil-2am? vlr 'r=-2.9s14r NUT-1.45651 h s:

nn-amzssr 1 so-zsmer i B t-Plano vm... 'h-LIT'MF xns-usm s=-::.ss

Rip-2.00451 I I IX 'n-nmr l min-1.61m 3 44.30 Bis-4.73MB I generally shown at 2. It includes the following components: a The foregoing parameters of radius. thickness. and spacing front single lens 4, a single lens 6, a single lens I, a doublet 10, Ire l d 0n lhe Vlll" 0 h Vllue F in m. 3-! n a doublet l2, and a doublet 14, all of said components being an example, is 1.820. At this focal length, the absolute values of the foregoing data is as follows:

F 1.820 Magnification l00XN.A. 1.25

What is claimed is:

1. An achromatic microscope objective having a magnification of substantially lOOX and a numerical aperture of substantially 1.25 for forming an image of an object plane, said 2. An achromatic microscope objective having a magnification of substantially 100K and a numerical aperture of substantially L25 for forming an image of an object plane, said image being well corrected for chromatic aberrations, coma,

image being well corrected for chromatic aberrations, coma, s "Efi ind F dim!" j astigmatism, and curvature of image field, said objective com- P l l p prising the following components: a from P lefll a from lano-convex Ian; I; I second COIIClVO-COIIVQX lens ll; a second concave-convex lens ii; I O flmd concv'aconvex a third concavo-convex lens ill; a fourth convex-concave lens element IV; a fourth convex-concave lens element IV; a fiflh double convex lens element V; a fifth double convex ens elem n V; said fourth and fifth elements forming a doublet; sa d fgurth and fifth elerlnentslformtngvt; doublet; a sixth convebconcave [em element v]; 223 :gtg xfzzz r i:33: IS a seventh convex-concave lens element Vll;

. said si t v said sixth and seventh elements forming a doublet; a ei a emh t sgli an eighth piano-convex lens element Vill; d g lx a ninth double concave lens element ix; 8 e i e said eighth and ninth elements forming a doublet; 2o "3p mmh m Q' B dmibmv all of said components being optically aligned; of P y '8" h the parameters of lens radii (R), thicknesses (T), spacings paramem'f thlckncs'" (1)- spacing! (S), refractive indices (ND), and Abbe numbers (7), (M3) fi "P '7) being detennined by the following relationship wherein 'll d'ftemmed by the ?"""i lp fi radii, thicknesses, and spacings are expressed in millime- 5 menus and are Pressed m ters: ters MAGNIF1CAT10N=100X N.A.=1.25

Ahho Refractive Number Lens Radius R Thickness T Space S I ndcx ND v sI=-.I7oaF Ri=Plano I Ti=l.5110F ND1-L5l700 y1=s4.50

' s2=.0II0F R3= --'Z.8995F II T1=1.0165F ND2=L60650 v2=43.93

S3=.0110F Ri= 7.2l98F III T =LO879F NDfl-LGOMO 5:43.93

Rs=4.4868F S4=JB48F R1=7.2198F IV Tl=.6593F ND4=L80491 4=25.4a

Rs=4.3852F V T5=2.8616F ND5=L4860I y5=s-t.47

R@=s.41s7F s5==.027sF R =7.79l2F \'I.. Ts=.6593F ND6=L80491 P6=25A3 R|1=2.8731F VII T7=2.9374F ND7=L48661 v7=84.47

S6=7.30l6F R =Piuno v1n.. TQ=L1725F NBS-1.76496 vs-zms Ru= -2.9945F IX T9=.9929F NDO-L6133 0-44.30

F=L820 MAGN1FICATION=100X NA. 1.25

f 5 Abbe Tltlck- Refractive Number Lcns Radius R ness '1 Space S i Index ND Sl=.3l R =Plnno I T1=2.750 j NDI=L51700 vl=t')-i.50

s2=.02 R3: 5.277 II T=L850 l ND2=L60550 l v2=43133 R|=3.678 l l s3=.02 Rs=13.140 I III Ts=LQM ND3=L60550 3=43.93

Ra=8.166 s4=.300 B1=13.140 Iv T4=1.200 ND-i=L80491 v4=25A3 R =7.98l v.. T =6.l90 NI)5=1.48651 r5=8L-i7 Rs=-9.862 j H5=.05 I lt =t4.m0 

1. An achromatic microscope objective having a magnification of substantially 100X and a numerical aperture of substantially 1.25 for forming an image of an object plane, said image being well corrected for chromatic aberrations, coma, astigmatism, and curvature of image field, said objective comprising the following components: A FRONT PLANO-CONVEX LENS I; a second concavo-convex lens II; a third concavo-convex lens III; a fourth convex-concave lens element IV; a fifth double convex lens element V; said fourth and fifth elements forming a doublet; A SIXTH CONVEX-CONCAVE LENS ELEMENT VI; a seventh convex-concave lens element VII; said sixth and seventh elements forming a doublet; AN EIGHTH PLANO-CONVEX LENS ELEMENT VIII; a ninth double concave lens elEment IX; said eighth and ninth elements forming a doublet; all of said components being optically aligned; the parameters of lens radii (R), thicknesses (T), spacings (S), refractive indices (ND), and Abbe numbers ( gamma ), being determined by the following relationship wherein radii, thicknesses, and spacings are expressed in millimeters:
 2. An achromatic microscope objective having a magnification of substantially 100X and a numerical aperture of substantially 1.25 for forming an image of an object plane, said image being well corrected for chromatic aberrations, coma, astigmatism, and curvature of image field, said objective comprising the following components: a front plano-convex lens I; a second concavo-convex lens II; a third concavo-convex lens III; a fourth convex-concave lens element IV; a fifth double convex lens element V; said fourth and fifth elements forming a doublet; a sixth convex-concave lens element VI; a seventh convex-concave lens element VII; said sixth and seventh elements forming a doublet; an eighth plano-convex lens element VIII; a ninth double concave lens element IX; said eighth and ninth elements forming a doublet; all of said components being optically aligned; the parameters of lens radii (R), thicknesses (T), spacings (S), refractive indices (ND), and Abbe numbers ( gamma ), being determined by the following relationship wherein radii, thicknesses, and spacings are expressed in millimeters: 